Identification of Contour Lines from Average-Quality Scanned Topographic Maps

Table 1

Evaluation results of different clustering algorithms.

Images sizes	FCM				sFCM				The improved sFCM
			(×10^−3)	Time (s)			(×10^−3)	Time (s)			(×10^−3)	Time (s)
(Figure 8(a))	0.867	0.274	1.218	1.7	0.907	0.198	1.519	1.8	0.906	0.198	1.521	1.7
(Figure 9(a))	0.886	0.241	0.982	2.5	0.916	0.176	1.082	2.7	0.914	0.177	1.086	2.4
(Figure 10(a))	0.801	0.360	2.453	31.0	0.857	0.291	2.924	39.5	0.856	0.292	2.925	27.6
	0.749	0.452	2.834	314.6	0.805	0.357	3.505	375.9	0.802	0.359	3.510	286.2
	0.819	0.337	2.019	689.2	0.879	0.273	2.708	810.7	0.876	0.275	2.713	574.3